I'm on Salofalk, been on it for years... I don't know how exact the science of the 'buffering' compound is... and I think (to use a crude analogy) the use of any of the 5ASA drugs for treating this disease is akin to using depth charges to hunt for submarines without the benefit of sonar. It's a scattergun attack with little chance of truly being effective (for want of a better term). But, aside from changing the color of my urine, (it turned the same color as the pills, just to forewarn you, OK?), it really hasn't done me any harm, and I figure every once in a while it does hit a patch of inflammation. As to why your doc switched, could be any reason... from he thinks it will do some good TO the new Salofalk rep is really attractive. Only one who can answer that is the culprit, eer 'doc'